Normalizing BSON documents allows you to perform the following operations with improved performance:

• Cross-type comparison for numeric types.

• Compare across multiple data types, as defined in Comparison/Sort Order.

• Build indexes using normalized computed columns.

• Sort and hash BSON documents.

This is a set of four BSON functions that normalize BSON documents.

• BSON_NORMALIZE(): Normalizes the BSON document for equality comparisons (such as $eq).

• BSON_NORMALIZE_ASC(): Normalizes the BSON document for ascending sort or less than comparisons, (such as $lt). For arrays, the smallest element is selected.

• BSON_NORMALIZE_DESC(): Normalizes the BSON document for descending sort or greater than comparisons, (such as $gt). For arrays, the largest element is selected.

• BSON_NORMALIZE_NO_ARRAY(): Similar to BSON_NORMALIZE(), it normalizes the BSON document for equality comparisons (such as $eq), but returns an error if the BSON document contains an array at any level.

BSON_NORMALIZE(<bson_input>)

BSON_NORMALIZE_ASC(<bson_input>)

BSON_NORMALIZE_DESC(<bson_input>)

BSON_NORMALIZE_NO_ARRAY(<bson_input>)

SELECT BSON_NORMALIZE('0':>BSON) = BSON_NORMALIZE('{"$numberDouble":"0"}':>BSON) AS Result;

+--------+
| Result |
+--------+
|      1 |
+--------+